The mode of action of Ecstasy is to
a. cause overstimulation of target cells in the brain.
b. interfere with release of neurotransmitters in the brain.
c. decreases the amount of serotonin in the brain.
d. speed up clearance of serotonin in the brain.
e. is used clinically to treat anxiety.
A
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Lyme disease is limited almost exclusively to the northeastern United States
Indicate whether the statement is true or false.
Ringworm is a skin infection with a fungus, not a worm! In this case, the fungus acts as a
a. decomposer. b. parasite. c. pathogen. d. predator
Herbivores are ____ energy transfer(s) away from the sun
a. one b. two c. three d. four e. five
Gills are unsuitable for animals living on land because
A) the large external surface area of gills would allow dehydration of the animal. B) air cannot diffuse across the gill surface. C) there is no way to get air into the gills. D) gills require high blood pressure.